Some Christians viewed Jews as enemies of Christianity is your best answer.
As in the bible, it states that it was the Jews that wanted Jesus (whom the Christians believed to be the son of God) to be crucified, and so in return, the crusaders began to slaughter most of them. This was inexcusable, and led to the Church having to provide established order and justice.
~
Jews never attacked the Christians so the first one is wrong.
Jews were already living in Holy Land along side the Muslims so the second one is wrong too.
European Jews attached by the Crusaders had no contact with Muslims. The third choice is not right.
The only choic left n the right ans Some Christians viewed Jews as enemies of Christianity.
